Zhongguo shipin weisheng zazhi (Nov 2021)
Study of the migration law of UV absorbants in polyethylene food contact materials based on deterministic migration model
Abstract
ObjectiveThe migration of three kinds of UV absorbants [2-hydroxy-4-methoxybenzophenone (UV-9), 2-(2-hydroxy-5-methylphenyl)benzotriazole (UV-71) and 2-hydroxy-4-n-octyloxybenzophenone (UV-531)] in low density polyethylene (LDPE) food contact materials under different conditions was studied. Based on the Piringer deterministic migration model, the important parameters — distribution coefficient and diffusion coefficient — of adsorption and diffusion were obtained, and the migration law were studied.MethodsLDPE powder and three kinds of UV absorbents were mixed and granulated by twin screw extruder, and the film was formed at 175-180 ℃ and 70 Pa. Simulating processing and storage of high-concentration alcoholic food, 50%, 70% and 95% ethanol were used as food simulations, and the migration tests were carried out under 20, 40 and 60 ℃. Ultra-high performance liquid chromatography (UPLC) was used to determine the migration content of UV absorbents at different time points. The diffusion coefficient and distribution coefficient were obtained by fitting the data with Piringer model. The influence of temperature, food simulants, and target content on migration were studied.ResultsTemperature had the greatest effect on migration. With the increase of temperature, the diffusion coefficient of UV absorbents increased and the distribution coefficient decreased. The effect of ethanol content in food simulants on the diffusion coefficient of UV absorbent was not significant, but the distribution coefficient decreased with the increase of ethanol content. The content of UV absorbent had the least effect on the migration, and the diffusion coefficient and distribution coefficient had no obviously change (except that the distribution coefficient of UV-71 decreased with the increase of the content).ConclusionThe Piringer deterministic model was used to study the diffusion coefficient and distribution coefficient of the migration of three kinds of UV absorbents in LDPE to high concentration alcoholic food simulant, which provided an effective method for the risk assessment of UV absorbents in food contact materials.
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